Black screen between SplashScreen and first viewController when using flutter app like module in native iOS app.

1. I am creating a module according to this instruction.
2. Add it to clear ios project.
3. When app starts black screen appear after spashScreen. In debug mode it appears for more than 1 second, in release – for a monent.
4. I tried to change “splashScreen” and “splashScreen.storyboard” in info.plist and it didn’t help

flutter doctor -v:

[✓] Flutter (Channel stable, 3.22.1, on macOS 14.4 23E214 darwin-arm64, locale ru-RU)
    • Flutter version 3.22.1 on channel stable at /Users/sishemet/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision a14f74ff3a (2 weeks ago), 2024-05-22 11:08:21 -0500
    • Engine revision 55eae6864b
    • Dart version 3.4.1
    • DevTools version 2.34.3

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
    • Android SDK at /Users/sishemet/Library/Android/sdk
    • Platform android-34, build-tools 33.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
    • Xcode at /Applications/Xcode_15_3.app/Contents/Developer
    • Build 15E204a
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      ???? https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      ???? https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] VS Code (version 1.88.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.90.0

[✓] Connected device (7 available)
    • sdk gphone64 arm64 (mobile)     • emulator-5554                        • android-arm64  • Android 13 (API 33) (emulator)
    • iPhone (2) (mobile)             • 00008120-001A44E02238C01E            • ios            • iOS 17.5.1 21F90
    • iPhone 15 Pro (mobile)          • 4A597778-D2E0-4B32-8738-8DF40540CF3B • ios            • com.apple.CoreSimulator.SimRuntime.iOS-17-2 (simulator)
    • iPhone 15 Pro (mobile)          • 48C90453-3176-44D2-894B-4DAABCB59B5D • ios            • com.apple.CoreSimulator.SimRuntime.iOS-17-4 (simulator)
    • macOS (desktop)                 • macos                                • darwin-arm64   • macOS 14.4 23E214 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad                • darwin         • macOS 14.4 23E214 darwin-arm64
    • Chrome (web)                    • chrome                               • web-javascript • Google Chrome 125.0.6422.142

[✓] Network resources
    • All expected network resources are available.

My appDelegate file:

import Flutter
import FlutterPluginRegistrant
import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        let flutterEngine = FlutterEngine(name: "flutter engine")
        flutterEngine.run()
        
        GeneratedPluginRegistrant.register(with: flutterEngine)
        
        let flutterVC = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
        
        window = UIWindow(frame: UIScreen.main.bounds)
        
        window?.rootViewController = flutterVC
        
        window?.makeKeyAndVisible()
        
        return true
    }
}